xref: /illumos-gate/usr/src/cmd/svc/milestone/net-svc (revision 492b87fe195c0c6659a8d9d1fbc4e735177b2413) 
1#!/sbin/sh
2#
3# CDDL HEADER START
4#
5# The contents of this file are subject to the terms of the
6# Common Development and Distribution License (the "License").
7# You may not use this file except in compliance with the License.
8#
9# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10# or http://www.opensolaris.org/os/licensing.
11# See the License for the specific language governing permissions
12# and limitations under the License.
13#
14# When distributing Covered Code, include this CDDL HEADER in each
15# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16# If applicable, add the following below this CDDL HEADER, with the
17# fields enclosed by brackets "[]" replaced with your own identifying
18# information: Portions Copyright [yyyy] [name of copyright owner]
19#
20# CDDL HEADER END
21#
22#
23# Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
24# Use is subject to license terms.
25#
26
27#
28# This is third phase of TCP/IP startup/configuration.  This script
29# runs after the NIS startup script.  We run things here that may
30# depend on NIS maps.
31#
32
33. /lib/svc/share/smf_include.sh
34. /lib/svc/share/net_include.sh
35
36NWAM_FMRI="svc:/network/physical:nwam"
37
38case "$1" in
39'start')
40	#
41	# In a shared-IP zone we need this service to be up, but all of the
42	# work it tries to do is irrelevant (and will actually lead to the
43	# service failing if we try to do it), so just bail out.
44	# In the global zone and exclusive-IP zones we proceed.
45	#
46	smf_configure_ip || exit $SMF_EXIT_OK
47
48	#
49	# If nwam is enabled, the nwam service will handle the tasks performed
50	# by this service, so just bail out.
51	#
52	service_is_enabled $NWAM_FMRI && exit $SMF_EXIT_OK
53	;; # fall through -- rest of script is the initialization code
54
55'stop')
56	exit $SMF_EXIT_OK
57	;;
58
59*)
60	echo "Usage: $0 { start | stop }"
61	exit 1
62	;;
63esac
64
65interface=$2
66
67# If boot variables are not set, set variables we use
68[ -z "$_INIT_UTS_NODENAME" ] && _INIT_UTS_NODENAME=`/usr/bin/uname -n`
69
70#
71# This function takes two file names and the file mode as input. The two
72# files are compared for differences (using cmp(1)) and if different, the
73# second file is over written with the first. A chmod is done with the file
74# mode passed in. If the files are equal, the first file passed
75# in (the /tmp file) is deleted.
76#
77mv_file ()
78{
79	/usr/bin/cmp -s $1 $2
80	if [ $? -eq 1 ]; then
81		/usr/bin/mv $1 $2
82		#
83		# The umask during boot is configurable, which requires
84		# explicit setting of file permission modes when we
85		# create files.
86		#
87		/usr/bin/chmod $3 $2
88	else
89		/usr/bin/rm $1
90	fi
91}
92
93#
94# This function takes a DHCP parameter (as defined in /etc/dhcp/inittab)
95# and returns the value for that parameter returned by the DHCP server.
96# If the global 'interface' is defined, it will request the value learned
97# on that interface, else it will request the value learned on the primary
98# interface.
99#
100get_dhcp_var ()
101{
102	if [ -n "$interface" ]; then
103		/sbin/dhcpinfo -i $interface $1
104	else
105		/sbin/dhcpinfo $1
106	fi
107}
108
109#
110# This function returns true if the string "# Added by DHCP$" occurs in
111# the passed-in file, false otherwise.
112#
113dhcp_edits ()
114{
115	/usr/bin/grep '# Added by DHCP$' $1 >/dev/null 2>&1
116	return $?
117}
118
119#
120# update_resolv()
121# Go through /etc/resolv.conf and replace any existing domain or
122# nameserver entries with new ones derived from DHCP.  Note that
123# it is important to preserve order of domain entries vs. search
124# entries; the search entries are reserved for administrator
125# customization and if placed after the domain entry will override
126# it.  See resolv.conf(5).
127#
128# The first arg should be the dns servers string, the second
129# should be the dns domain.
130#
131update_resolv ()
132{
133	dnsservers=$1
134	dnsdomain=$2
135
136	if [ ! -f /etc/resolv.conf ]; then
137		/usr/bin/touch /etc/resolv.conf
138	fi
139	export dnsservers dnsdomain
140	/usr/bin/nawk </etc/resolv.conf >/tmp/resolv.conf.$$ '
141		function writedomain() {
142			if (updated == 0) {
143			    	# Use only first domain, not a search list
144			    	split(ENVIRON["dnsdomain"], d)
145				if(length(d[1]) != 0)
146					printf("domain %s\n", d[1])
147			}
148			++updated
149		}
150		$1 == "domain" { writedomain(); next }
151		$1 != "nameserver" { print $0 }
152		END {
153			writedomain()
154			n = split(ENVIRON["dnsservers"], s)
155			for (i = 1; i <= n; ++i)
156				printf("nameserver %s\n", s[i])
157		}'
158	unset dnsservers dnsdomain
159	mv_file /tmp/resolv.conf.$$ /etc/resolv.conf 644
160}
161
162#
163# update_nss()
164# This routine takes as a parameter, the name of the respective policy
165# to change in the nsswitch.conf (hosts or ipnodes) to update with dns.
166#
167update_nss ()
168{
169	policy=$1;
170	# Add dns to the nsswitch file, if it isn't already there.
171	/usr/bin/awk ' $1 ~ /^'${policy}':/ {
172		n = split($0, a);
173		newl = a[1];
174		if ($0 !~ /dns/) {
175			printf("#%s # Commented out by DHCP\n", $0);
176			updated = 0;
177			for (i = 2; i <= n; i++) {
178				if (updated == 0 && index(a[i], "[") == 1) {
179					newl = newl" dns";
180					updated++;
181				}
182				newl = newl" "a[i];
183			}
184			if (updated == 0) {
185				newl = newl" dns";
186				updated++;
187			}
188			if (updated != 0)
189				newl = newl" # Added by DHCP";
190			else
191				newl = $0;
192			printf("%s\n", newl);
193		} else
194			printf("%s\n", $0);
195	} $1 !~ /^'${policy}':/ { printf("%s\n", $0); }' /etc/nsswitch.conf \
196	    >/tmp/nsswitch.conf.$$
197
198	mv_file /tmp/nsswitch.conf.$$ /etc/nsswitch.conf 644
199}
200
201#
202# Remove any lines with the "# Added by DHCP" tag from /etc/nsswitch.conf;
203# also uncomment hosts and ipnodes entries which were previously commented
204# out by this script.
205#
206cleanup_nss ()
207{
208	/usr/bin/sed \
209	    -e '/# Added by DHCP$/d' \
210	    -e 's/^\(#hosts:\)\(.*[^#]\)\(#.*\)$/hosts: \2/' \
211	    -e 's/^\(#ipnodes:\)\(.*[^#]\)\(#.*\)$/ipnodes: \2/' \
212	    /etc/nsswitch.conf >/tmp/nsswitch.conf.$$
213
214	mv_file /tmp/nsswitch.conf.$$ /etc/nsswitch.conf 644
215}
216
217#
218# Remove any lines with the "# Added by DHCP" tag from /etc/inet/hosts.
219#
220cleanup_hosts ()
221{
222	/usr/bin/nawk '{
223		if (index($0, "# Added by DHCP") == 0 ||
224		    $1 == "127.0.0.1" || $1 == "::1") {
225			print $0
226		}
227	}' /etc/inet/hosts > /tmp/hosts.$$
228	mv_file /tmp/hosts.$$ /etc/inet/hosts 444
229}
230
231#
232# If our network configuration strategy is DHCP, check for DNS
233# configuration parameters obtained from the DHCP server.
234#
235# Script execution starts here.
236#
237smf_netstrategy
238
239if [ "$_INIT_NET_STRATEGY" = "dhcp" ]; then
240	dnsservers=`get_dhcp_var DNSserv`
241	dnsdomain=`get_dhcp_var DNSdmain`
242else
243	dnsservers=""
244	dnsdomain=""
245fi
246
247if [ -n "$dnsservers" ]; then
248	#
249	# add settings retrieved from dhcp server to /etc/resolv.conf
250	#
251	update_resolv "$dnsservers" "$dnsdomain"
252
253	#
254	# Add dns to the nsswitch file, if it isn't already there.
255	#
256	update_nss hosts
257	update_nss ipnodes
258
259elif dhcp_edits /etc/nsswitch.conf; then
260	# If we added DNS to the hosts and ipnodes
261	# policy in the nsswitch, remove it.
262	cleanup_nss
263fi
264
265if dhcp_edits /etc/inet/hosts; then
266	# Clean up any old DHCP-added entries
267	# (except loopback) in the hosts file.
268	cleanup_hosts
269fi
270
271